JPS628480A - Brush wear forecast measuring apparatus for current collector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to, for example, a brush wear prediction and measurement device for a current collector that supplies direct current to an excitation coil of a rotating electric machine.

[Technical background of the invention and its problems]

Generally, a current collector consisting of a combination of a collector ring and a brush is used as a means for passing current through an excitation coil of a rotating electric machine. Therefore, when a rotating electric machine is operated for a certain amount of time, the brushes will wear out due to wear between the collector ring of the current collector and the brushes.Normally, a supervisor will periodically patrol and check the wear status of the brushes. If the level exceeded a predetermined level, they would be replaced.

However, this patrol requires a considerable amount of effort from the operator, and if the operator overlooks the inspection of the wear status of the brushes, the brushes will wear out further and the rotating electric machine itself will no longer be able to operate. Eventually, there was a problem in which the rotating electric machine broke down.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a brush wear prediction and measurement device for a current collector that can monitor brush wear prediction without operator patrols.

[Summary of the invention]

The brush wear prediction and measurement device for a current collector according to the present invention detects a brush that slides in contact with a collector ring of a current collector of a rotating electric machine and the degree of wear of this brush, and measures
A wear detection section that outputs pulse signals compares the cumulative number of pulse signals from this wear detection section with the number of pulse signals corresponding to a preset brush wear limit and outputs the number of wear remaining pulse signals. a pulse counting calculation circuit that detects the pulse signal sequence; a pulse signal interval time detection circuit that detects the interval time of the pulse signal train from the wear detection section; and a pulse signal interval time output from the pulse signal interval time detection circuit and the current collector. An operating time calculation circuit that calculates the actual operating time required for wear per one pulse signal by calculating the net operating time of The present invention is characterized by comprising a wear prediction time calculation circuit which multiplies the wear residual pulse signal outputted from the pulse counting calculation circuit and outputs a brush wear prediction time.

[Embodiments of the invention]

The present invention will be explained below with reference to the drawings. In the drawings, the current collector according to the present invention includes a collector ring 1 connected to an excitation circuit of a rotating electric machine, and a brush for supplying current to the collector ring 1. 2, a brush holder 3 that holds this brush 2, a wear detection section 7 provided on the side surface of the brush 2, and a brush wear prediction conversion section 9 that processes a detection signal from this wear detection section 7. ing.

By the way, the brush 2 is provided with a mechanical unevenness 6 on its side surface so that the brush wear position can be detected, and is held by a brush holder 3.

This brush holder 3 holds the brush 2 in a fixed position on the collector ring 1, and also presses the brush 2 with a constant pressure spring 4 so that it can slide on the rotating collector ring 1, so that it is in good contact with the collector ring 1. Moreover, it is configured to make sliding contact while maintaining a safe contact pressure. Further, the brush 2 is provided with a pigtail 5, and a voltage is applied to the pigtail 5.

The wear detection section 7 is insulated from the brush 2, and when the brush 2 moves downward due to wear of the brush 2, it is pushed by the protrusion 6 of the brush 2, and the mechanical contact 8 of the wear detection section 7 opens and closes. It is configured so that one pulse signal is output each time one convex portion 6 reaches. That is, this wear detection section 7 detects the degree of wear of the brush 2 and outputs one pulse signal for each arbitrary amount of wear. Although mechanical brush wear detection means is used in the wear detection section 7, it is of course possible to use optical brush wear detection means.

On the other hand, the pulse signal detected from the wear detection section 7 is transmitted to the brush wear prediction conversion section 9. This brush wear prediction converter 9 includes a pulse counting circuit 10, a pulse setting generation circuit 11, a pulse counting calculation circuit 12, a pulse interval time detection circuit 13, an operation stop time detection circuit 14, an operation time calculation synthesis circuit 15, and a wear prediction time. Calculation time! G16.

The pulse counting circuit IO integrates the pulse signals output from the wear detection section 7, the pulse setting generation circuit 11 sets and outputs a predetermined number of pulses, and the pulse counting calculation circuit 12 integrates the pulse signals output from the wear detection section 7. The number of pulses Pc detected by the pulse setting generation circuit 11 is subtracted from the number of pulses PS preset by the pulse setting generation circuit 11, and the number of wear remaining pulses (Ps Pc) is output.

Further, the pulse interval time detection circuit 13 measures the interval time TP of the pulse signal train output from the wear detection section 7, and the operation stop time detection circuit 14 measures and outputs the operation stop time Ts of the rotating electric machine.

Furthermore, the operation time calculation and synthesis circuit 15 calculates the net operation time To by subtracting the operation stop time T3 detected by the operation stop time detection circuit 14 from the total operation time T of the rotating electric machine, and further calculates the net operation time To and the pulse interval. Time detection circuit 13
The actual operating time TB required for wear per pulse is output from the calculation with the pulse interval time TP obtained in .

Furthermore, 1 is output from this operation time calculation and synthesis circuit 15.
Actual operating time T8 required for wear per pulse.

It is provided with a wear prediction time calculation circuit 16 that multiplies the wear residual pulse number (Ps Pc) outputted from the pulse count calculation circuit 12 and outputs a brush wear prediction time Tx. And this wear prediction time calculation circuit 16
The output Tx is outputted to the next stage, such as a brush wear prediction time reporting device (not shown), to predict the degree of brush wear.

Next, we will explain the operation of the current collector brush wear prediction and measurement device according to the present invention.When a one-rotation electric machine is operated,
Since the brush 2 in contact with the collector ring 1 becomes worn, the brush 2 moves downward from the drawing position. Then, the uneven portion 6 provided on the side surface of the brush 2
Since this also moves downward, the mechanical contact 8 of the wear detection section 7 installed on this uneven portion 6 opens and closes.
A pulse signal is generated in response to the opening/closing operation of the mechanical contact 8.

This generated pulse signal is transmitted to the brush wear prediction conversion section 9. Pulse counting circuit 1 of brush wear prediction converter 9
0, the pulse signals transmitted from the wear detection section 7 are integrated, and the result is input to the pulse counting calculation circuit 12. In the pulse counting calculation circuit 12, the accumulated pulse number PC input from the pulse counting circuit IO is calculated by the pulse setting generation circuit 1.
The number of pulses Ps preset in 1 and the subtraction operation (Ps-P
C) and output the number of wear remaining pulses.

At this time, the wear detection section 7. The pulse signal transmitted from , is sent to another pulse interval time detection circuit 13, which measures the interval time between the previous pulse signal and the currently generated pulse signal, and inputs the result to the operating time calculation and synthesis circuit 15. do. The operation time synthesis circuit 15 calculates the net operation time To by subtracting the operation stop time Ts detected by the operation stop time detection time detection circuit 14 from the total operation time T of the rotating electric machine, and calculates the net operation time To and the pulse interval time. From the pulse interval time output from the detection circuit 13, the actual operating time TB required for wear per pulse is calculated.

Then, the wear prediction time calculation circuit 16 calculates the number of wear remaining pulses (Ps Pc) of the brush 2 outputted from the pulse counting calculation circuit 12 and the actual operating time required for wear per pulse outputted from the operation time synthesis circuit 15. (Tp-
Ts) and the composite operation (Ps-Pc)X (Tp Ts
) Calculate the predicted wear time of the brush using L/. This predicted brush wear time is output to a brush wear prediction time reporting device (not shown), and an alarm is issued when the brush wear limit is reached.

Furthermore, if the output of the rotating machine brush wear prediction measuring device of the present invention, that is, the predicted brush wear time, is transmitted to, for example, a central control room and monitored on a display in the central control room, it is possible to patrol the rotating machine. It is possible to eliminate work that is a burden on the operator, and it is also possible to avoid overlooking the inspection of the wear status of the rotating machine brushes.

〔Effect of the invention〕

As described above, according to the present invention, the life expectancy due to brush wear can be accurately measured.

Failure of the rotating electric machine can be prevented.

Furthermore, since the state of wear of the brushes of the rotating electric machine can be constantly monitored, maintenance work by operators can be significantly reduced, and the reliability of the operation of the rotating electric machine can be improved.

[Brief explanation of the drawing]

The drawing is a configuration diagram showing an embodiment of a brush wear prediction and measurement device for a current collector according to the present invention. 1... Collector ring 2... Brush 3... Brush holder 4... Constant pressure spring 5... Pigtail 6... Uneven part 7... Wear detection part 8.
...Mechanical contact 9...Brush wear prediction converter lO...Pulse counting circuit 11...Pulse setting generation circuit 12...Pulse counting calculation circuit 13...Pulse interval time detection circuit I4... - Operation stop time detection circuit 15... Operating time calculation synthesis circuit 16... Wear prediction time calculation circuit. Agent Patent Attorney Kodo Sho Inomata Hiroko Inomata

Claims (1)

[Claims] (1) A brush that slides into contact with the collector ring of the current collector of a rotating electric machine, a wear detection unit that detects the degree of wear of this brush and outputs one pulse signal for each arbitrary amount of wear, and a a pulse counting calculation circuit that compares and calculates the cumulative number of pulse signals and the number of pulse signals corresponding to a preset brush wear limit and outputs the number of wear remaining pulse signals; and a pulse signal train from the wear detector. A pulse signal interval time detection circuit that detects the interval time of , a pulse signal interval time output from this pulse signal interval time detection circuit, and the net operating time of the current collector are calculated to calculate the wear per pulse signal. An operation time calculation circuit that outputs the required actual operation time, and the actual operation time required for wear per pulse output from this operation time calculation circuit is multiplied by the number of wear remaining pulse signals output from the pulse counting calculation circuit. 1. A brush wear prediction and measurement device for a current collector, comprising a wear prediction time calculation circuit that outputs a brush wear prediction time.